OptionsDefaultFormatter.php in Drupal 8

Namespace

Drupal\options\Plugin\Field\FieldFormatter

File

core/modules/options/src/Plugin/Field/FieldFormatter/OptionsDefaultFormatter.php

<?php

namespace Drupal\options\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\AllowedTagsXssTrait;
use Drupal\Core\Field\FieldFilteredMarkup;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\OptGroup;

/**
 * Plugin implementation of the 'list_default' formatter.
 *
 * @FieldFormatter(
 *   id = "list_default",
 *   label = @Translation("Default"),
 *   field_types = {
 *     "list_integer",
 *     "list_float",
 *     "list_string",
 *   }
 * )
 */
class OptionsDefaultFormatter extends FormatterBase {
  use AllowedTagsXssTrait;

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];

    // Only collect allowed options if there are actually items to display.
    if ($items
      ->count()) {
      $provider = $items
        ->getFieldDefinition()
        ->getFieldStorageDefinition()
        ->getOptionsProvider('value', $items
        ->getEntity());

      // Flatten the possible options, to support opt groups.
      $options = OptGroup::flattenOptions($provider
        ->getPossibleOptions());
      foreach ($items as $delta => $item) {
        $value = $item->value;

        // If the stored value is in the current set of allowed values, display
        // the associated label, otherwise just display the raw value.
        $output = isset($options[$value]) ? $options[$value] : $value;
        $elements[$delta] = [
          '#markup' => $output,
          '#allowed_tags' => FieldFilteredMarkup::allowedTags(),
        ];
      }
    }
    return $elements;
  }

}

Classes

Name	Description
OptionsDefaultFormatter	Plugin implementation of the 'list_default' formatter.